Make it the headquarters for heroic and villainous groups by offering considerable incentives, but strictly enforcing a truce while on the netherworld. We would then stage epic battles occasionally resulting in the destruction of other netherworlds. We would film the ensuing carnage, and produce tv shows, license them into games, and extort people, lest their netherworld be used as the next set. We would also double as an orphanage, taking in stray demons and whipping them into the next generation of heroes and villains, earning us respect from normal demons for making orphans fight for our amusement, but also gaining respect from demon rebels, since we take in and raise war orphans.

The heroes and villains we have on-site serve as our defense, and our main jobs for non-heroes or villains are refreshment vendors, media distribution and localization, and merch manufacturers.

I'm too damn lazy to put anything clever here.

...and as my tag expired, proudly remember me as the official Mid Boss of the Disgaea JSRPG Squad! (Now imagine taps playing, and let a single, manly tear run down your cheek!)